Yes d war b/w tanu & tanuja had started. As some of us think that tanuja will transform into fully tanu , then I think it will height of stupidity that a person who got to know about her past life, had left her current life & started living her past life, bullshit. If we u remember film , Karz & om shanti om where rishi kapoor & shahruk Khan had taken rebirth , they both go to know d reason of their rebirth , then started working according to that 2 achieve their goal but they never let their past life rule their present life. Tanuja is also a rebirth of tanu , or u can say she is living tanu's desired life, that is to be rishi 's wife. If I remember in preleap tanu desired 2 have tattoo of rishi's name, tanuja has birthmark in r shape. Tanuja just go to know about d reason if her birth & it's cursed that why she is very depressed . She is tanu's rebirth , she will defiantely show shadow of tanu but she had not completely left her true self , tanuja us not letting tanu 2 overpower herself, she is fighting with tanu. If tanu would had taken over tanuja then rishi don't have to force tanuja 4 remarriage she would had agreed easily, coz tanu always choose easy way, accept d situation , sit & cry but tanuja is again begging goddess to help her to be with her luv or was ready to give away her life rather to be with some else.as tanuja not able to see any solution , so she is sacrificing, but d day she will find some solutions she will not sit & cry. Soul belong 2 tanu but heart & brain belongs 2 tanuja , which r currently not able to find solutions.
Rishi had realised his luv 4 tanuja, even his mistake if leaving her ,& Tanuja's innocence.he don't want to loose his luv once again . That's why he us had started supporting his luv , started to see d black merits of his family & specially his mother. Rishi is doing it 4 tanuja not tanu, it don't think it will make much diff 2 him when he gets to know about tanu's truth, he will get to know that tanu fulfilled her kasam, his luv 4 tanuja will increase as he already luvs her madly. When rishi will come to know about kundali truth , I guess he will only prefer tanuja over tanu , coz he knew tanu will never prefer to fight but he will only bring tanuja back to support him to fight with their destiny 4 their luv. Preleap rishi belonged 2 tanu , post leap rishi belong only 2 tanuja. Tanuja had guts & courage also 2 fight 4 her luv , if u see when she left BM she realised giving up ur luv 2 easily is not right, that's why she was returning 2 fight 4 her luv when accident happened. So fight v/w tanu & tanuja us going on but I m sure rishi will make sure tanuja defeat tanu & fight 4 her luv. Rishi only pointed out d Diff b/w tanu & tanuja, tanu always scolded him, tanuja prefer to fight with him. Tanuja will not do easily agree 2 marry anyone
Just my pov